EUCKR charset is sent as SET NAMES
euc_kr which MySQL-4.1 and newer doesn't understand.
(Bug #8629)

Added support for the EUC_JP_Solaris
character encoding, which maps to a MySQL encoding of
eucjpms (backported from 3.1 branch). This
only works on servers that support eucjpms,
namely 5.0.3 or later.
(Bug #8629)

Which requires hex escaping of binary data when using multibyte
charsets with prepared statements.
(Bug #8064)

Fixed duplicated code in
configureClientCharset() that prevented
useOldUTF8Behavior=true from working
properly.
(Bug #7952)

Backported SQLState codes mapping from Connector/J 3.1, enable
with useSqlStateCodes=true as a connection
property, it defaults to false in this
release, so that we don't break legacy applications (it defaults
to true starting with Connector/J 3.1).
(Bug #7686)

Statements created from a pooled connection were returning
physical connection instead of logical connection when
getConnection() was called.
(Bug #7316)

Support new protocol type MYSQL_TYPE_VARCHAR.
(Bug #7081)

Added useOldUTF8Behavior' configuration
property, which causes JDBC driver to act like it did with
MySQL-4.0.x and earlier when the character encoding is
utf-8 when connected to MySQL-4.1 or newer.
(Bug #7081)